Cisco 6800 Series Administration Manual page 167

Maintenance
Downgrade the Handsets
Note You can downgrade the base stations running Firmware version 5.0(1) only to the latest branch of Firmware
version 4.8(1) SR1.
The firmware filename contains the version (v) and branch number (b). For example,
6825-210_v0480_b0001.fwu is version 480 and branch 1. When you put the firmware version and branch
number into the Firmware Update page, you don't need the leading zeros.
The 6825 Handset, 6825 Ruggedized Handset, and 6823 Handset have their own firmware file.
After you start the downgrade from the web page, all handsets download and load the new firmware file. The
downgrade may take 20-30 minutes to download and verify, and an extra few minutes to load the new firmware
file on the handset. The handset must be placed in the charger and not removed until the handset loads the
firmware file and reboots. While the handset loads the new firmware, the LED flashes in the order green, red,
green, and amber. The handsets automatically reboot at the end of the downgrade.
The Extensions page shows the downgrade progress in the FWU Progress column.
• During the download, the column shows the download progress as a percentage. For example, 41%.
• After the file is downloaded, it's verified and the column shows the verification progress as a percentage.
• If the verification is complete and the handset isn't on the charger, the column shows Waiting for
• If the verification is complete and the handset is placed in the charger, the column shows Waiting
• When the downgrade is complete, the column shows Complete.
If the FWU Progress shows Off, the version and branch in the Firmware Update page are set to 0.
Note
We recommend that you download the base station first, then download the handsets after the base station
update completes.
Before you begin
Connect to the base station web page as described in
You need to have completed
the Firmware Files to the TFTP, HTTP, or HTTPS Server, on page
Procedure
Step 1 Click Firmware Update.
Step 2
Enter the new firmware version in the Required version field for all the handsets.
Step 3 Enter the branch number in the Required branch field for all the handsets.
For example, Verifying 23%.
charger.
for charger before it shows Restarting.
Set Up the Firmware Update Parameters, on page 153
Sign in to the Administration Web Page, on page
153.
Cisco IP DECT 6800 Series Administration Guide
Downgrade the Handsets
42.
and Download and Copy
159